<?php
/**
 * Created by PhpStorm.
 * User: yuanluke
 * Date: 4/27/16
 * Time: 14:44
 */

namespace App\Http\Utils\Common;


class FlagUtils {

    public static function uuid($prefix = '') {
        $chars = md5(uniqid(mt_rand(), true));
        $uuid  = substr($chars,0,8) . '-';
        $uuid .= substr($chars,8,4) . '-';
        $uuid .= substr($chars,12,4) . '-';
        $uuid .= substr($chars,16,4) . '-';
        $uuid .= substr($chars,20,12);
        return $prefix . $uuid;
    }

}